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Commentary by Pigini

Designing for Reliability or Resilience

August 11, 2018 • ARTICLE ARCHIVE, Commentary by PiginiComments Off on Designing for Reliability or Resilience

Projections on climate change confirm that power systems will be exposed to increasing threats of the type that jeopardize continuity and quality of supply. How best to respond to this evolving situation? Do we need to reinforce entire electric systems to deal with increased levels of stresses that were not considered during the design phase? ...

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Dielectric Strength & Air Density

July 21, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

While a number of atmospheric parameters can affect the dielectric strength of external insulation, relative air density (δ) and absolute humidity are considered the most significant. Here, I will focus on the former, which plays a key role in developing...

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‘Externalities’ of Overhead Power Lines

July 21, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

Public opposition and growing environmental awareness now make identifying corridors for new overhead lines an increasingly complex process – especially near densely populated or sensitive areas. Given this, it has become important to examine methodologies...

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Composite Insulators for DC

June 28, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

The world’s first DC lines were equipped with basically the same ceramic insulators used for AC. However, experience showed that, after only several years of service, there were problems with unacceptably high rates of puncture of porcelain and shattering...

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Corona Shielding for HVDC Line Insulators

June 16, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Corona

Power utilities and insulator manufacturers continue to express differing views as to the relative value of shielding electrodes in DC. Back in 1972, significant laboratory research had already been undertaken on the influence of shielding and grading...

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Revising IEC 60815

June 9, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Editorial Columns

Specifications contained in IEC 60815 “Selection and dimensioning of high-voltage insulators intended for use in polluted conditions” are the result of work going back to 2000 when international experts in WG11 first started to set up the documents. With...

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Application of Composite Insulators to HVDC Systems

Application of Composite Insulators to HVDC Systems

May 19, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Editorial Columns

As is long known, the design of insulation for DC transmission is much more demanding than for AC, particularly from the standpoint of pollution performance. Fig. 1 below, for example, derives from laboratory testing of ceramic insulators and plots unified...

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Insulator End of Life: Recycling vs. Disposal

Insulator End of Life: Recycling or Disposal

May 12, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Insulators

The focus when it comes to electrical products and components has traditionally been on quality and performance in service. Increasing public awareness of environmental issues, however, has now led both manufacturers and users to pay greater attention to the...

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